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Quaff · August 6th, 2006, 03:58

Hi, I recently purchased a STAR UMP. Earlier today I was testing it to see how well it performs.
I noticed right away that it would only fire one shot on semi auto, then stop functioning. I switched it to full auto and it worked fine, switched back to Semi and same problem, it fired one then stopped working. By stopped working I mean every trigger pull on semi, following the first that worked, would not make a sound at all, just a blank pull.

So I ran one full 110 round mag through on full auto, no problems. I only got halfway through the second mag before the motor started making a funny noise and the gun no longer fires. It sounds like a loud cordless drill.

I know extremely little about how airsoft guns work as I have very little practical experience with anything internal. So my best guess is that something has either broken or disconnected in between the motor and the piston?

The motor is: "High Torque Flat Motor" as stated in the manual. If anyone has any experience with this type of problem can you please PM me or post here. If you happen to be a gun doctor within an hour or so from Orillia Ontario, I would be interested in giving you some business.
Thank you.
Brian

Oh if anyone is interested, the gun shot GREAT for that first mag, I was very happy with the performance out of the box...you know, 'till it fried..

August 6th, 2006, 03:58	#1
Quaff Trader rating Join Date: Feb 2005	STAR UMP possible motor problem? Hi, I recently purchased a STAR UMP. Earlier today I was testing it to see how well it performs. I noticed right away that it would only fire one shot on semi auto, then stop functioning. I switched it to full auto and it worked fine, switched back to Semi and same problem, it fired one then stopped working. By stopped working I mean every trigger pull on semi, following the first that worked, would not make a sound at all, just a blank pull. So I ran one full 110 round mag through on full auto, no problems. I only got halfway through the second mag before the motor started making a funny noise and the gun no longer fires. It sounds like a loud cordless drill. I know extremely little about how airsoft guns work as I have very little practical experience with anything internal. So my best guess is that something has either broken or disconnected in between the motor and the piston? The motor is: "High Torque Flat Motor" as stated in the manual. If anyone has any experience with this type of problem can you please PM me or post here. If you happen to be a gun doctor within an hour or so from Orillia Ontario, I would be interested in giving you some business. Thank you. Brian Oh if anyone is interested, the gun shot GREAT for that first mag, I was very happy with the performance out of the box...you know, 'till it fried.. __________________